Safety System

The safety system module allows a series of trips and subsequent actions to be specified to model the turbine safety system. The safety system consists of a number of hard-wired trips and relays, arranged in one or more fail-safe circuits which act independently of the turbine controller, and are intended to bring the turbine safely to rest in the event of a problem which the normal control system cannot handle.

To define the safety system from the Bladed toolbar, use Specify > Control Systems > Safety system.

Safety System Circuits

One or more safety system circuits can be defined. These circuits can be tripped by various safety system trips or by the external controller. For each circuit, specify the actions that take place when the circuit is tripped. These actions include fail-safe pitch action, disconnecting the generator, applying shaft brakes, and disconnecting the yaw drive.

Safety System Pitch Action

The safety system pitch action is defined as part of the pitch actuator.

Safety System Trips

Six different trips are available. For each trip, specify which safety circuit it will activate.

There are four sensor trips: rotor speed, generator speed, generator power after electrical losses and nacelle vibration, which uses the magnitude of the horizontal nacelle acceleration vector. Specify the sensor trip level and the delay before the circuit is activated.

There is also a generator short-circuit trip, also with a specified delay, and an operator emergency stop button which can be activated at a specified time in the simulation.

Check Only activate safety system once output logging begins to prevent safety system activation during any transients at the beginning of the simulation before any output has been recorded.

Last updated 08-10-2024